<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18//babel.min.js"></script>
</head>
<body>
  <div id="app"> </div>
  <button id="btn">修改vDOM,重新渲染</button>
  <script type="text/babel">
    const vDOM=(
     <div>
      <h1>diffing算法</h1>
      <p>真NP</p>
      
      </div>
    )

    // 渲染到页面上
 const root= ReactDOM.createRoot(document.getElementById("app"))
 root.render(vDOM)

    // 给按钮绑定点击事件,修改vDOM  重新渲染
    // 当点击的时候,发现只有P标签重新渲染,其他元素还在浏览器中保留
    const oBtn=document.getElementById("btn");
    oBtn.onclick=function(){
      const vDOM=(
     <div>

      <h1>diffing算法</h1>
      <p>超级NB</p>
     
      </div>
    )
    root.render(vDOM)
    }
  </script>
</body>
</html>